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- Cosmic_variance abstract "The term cosmic variance is the statistical uncertainty inherent in observations of the universe at extreme distances. It has three different but closely related meanings: It is sometimes used, incorrectly, to mean sample variance - the difference between different finite samples of the same parent population. Such differences follow a Poissonian distribution, and in this case the term sample variance should be used instead. It is sometimes used, mainly by cosmologists, to mean the uncertainty because we can only observe one realization of all the possible observable universes. For example, we can only observe one Cosmic Microwave Background, so the measured positions of the peaks in the Cosmic Microwave Background spectrum, integrated over the visible sky, are limited by the fact that only one spectrum is observable from Earth. The observable universe viewed from another Galaxy will have the peaks in slightly different places, while remaining consistent with the same physical laws, inflation, etc. This second meaning may be regarded as a special case of the third meaning. The most widespread use, to which the rest of this article refers, reflects the fact that measurements are affected by cosmic large-scale structure, so a measurement of any region of sky (viewed from Earth) may differ from a measurement of a different region of sky (also viewed from Earth) by an amount that may be much greater than the sample variance.This most widespread use of the term is based on the idea that it is only possible to observe part of the universe at one particular time, so it is difficult to make statistical statements about cosmology on the scale of the entire universe, as the number of observations (sample size) must be too small.".
- Cosmic_variance wikiPageExternalLink 0305562.
- Cosmic_variance wikiPageID "238928".
- Cosmic_variance wikiPageLength "7718".
- Cosmic_variance wikiPageOutDegree "41".
- Cosmic_variance wikiPageRevisionID "676616745".
- Cosmic_variance wikiPageWikiLink Anthropic_principle.
- Cosmic_variance wikiPageWikiLink Big_Bang.
- Cosmic_variance wikiPageWikiLink Big_bang.
- Cosmic_variance wikiPageWikiLink Category:Physical_cosmology.
- Cosmic_variance wikiPageWikiLink Category:Statistical_deviation_and_dispersion.
- Cosmic_variance wikiPageWikiLink China.
- Cosmic_variance wikiPageWikiLink Cosmic_Background_Explorer.
- Cosmic_variance wikiPageWikiLink Cosmic_Microwave_Background.
- Cosmic_variance wikiPageWikiLink Cosmic_inflation.
- Cosmic_variance wikiPageWikiLink Cosmic_microwave_background.
- Cosmic_variance wikiPageWikiLink Evolutionary_biology.
- Cosmic_variance wikiPageWikiLink France.
- Cosmic_variance wikiPageWikiLink Galaxies.
- Cosmic_variance wikiPageWikiLink Galaxy.
- Cosmic_variance wikiPageWikiLink General_relativity.
- Cosmic_variance wikiPageWikiLink India.
- Cosmic_variance wikiPageWikiLink Inflation_(cosmology).
- Cosmic_variance wikiPageWikiLink Particle_horizon.
- Cosmic_variance wikiPageWikiLink Philosophy.
- Cosmic_variance wikiPageWikiLink Physical_cosmology.
- Cosmic_variance wikiPageWikiLink Physical_law.
- Cosmic_variance wikiPageWikiLink Physical_laws.
- Cosmic_variance wikiPageWikiLink Poisson_distribution.
- Cosmic_variance wikiPageWikiLink Poissonian_distribution.
- Cosmic_variance wikiPageWikiLink Probability_distribution.
- Cosmic_variance wikiPageWikiLink Quantum_mechanics.
- Cosmic_variance wikiPageWikiLink Random.
- Cosmic_variance wikiPageWikiLink Randomness.
- Cosmic_variance wikiPageWikiLink Sample_(statistics).
- Cosmic_variance wikiPageWikiLink Sample_size.
- Cosmic_variance wikiPageWikiLink Sample_size_determination.
- Cosmic_variance wikiPageWikiLink Sample_variance.
- Cosmic_variance wikiPageWikiLink Spherical_harmonic.
- Cosmic_variance wikiPageWikiLink Spherical_harmonics.
- Cosmic_variance wikiPageWikiLink Statistical_sample.
- Cosmic_variance wikiPageWikiLink Statistics.
- Cosmic_variance wikiPageWikiLink Titius–Bode_law.
- Cosmic_variance wikiPageWikiLink Uncertainty.
- Cosmic_variance wikiPageWikiLink United_States.
- Cosmic_variance wikiPageWikiLink Universe.
- Cosmic_variance wikiPageWikiLink Variance.
- Cosmic_variance wikiPageWikiLink WMAP.
- Cosmic_variance wikiPageWikiLink Wiktionary:perturbation.
- Cosmic_variance wikiPageWikiLink Wilkinson_Microwave_Anisotropy_Probe.
- Cosmic_variance wikiPageWikiLinkText "Cosmic variance".
- Cosmic_variance wikiPageWikiLinkText "cosmic variance".
- Cosmic_variance hasPhotoCollection Cosmic_variance.
- Cosmic_variance wikiPageUsesTemplate Template:CMB_experiments.
- Cosmic_variance wikiPageUsesTemplate Template:Cosmology.
- Cosmic_variance wikiPageUsesTemplate Template:For.
- Cosmic_variance wikiPageUsesTemplate Template:Portal_bar.
- Cosmic_variance wikiPageUsesTemplate Template:Reflist.
- Cosmic_variance subject Category:Physical_cosmology.
- Cosmic_variance subject Category:Statistical_deviation_and_dispersion.
- Cosmic_variance hypernym Uncertainty.
- Cosmic_variance type Physic.
- Cosmic_variance type Sub-discipline.
- Cosmic_variance comment "The term cosmic variance is the statistical uncertainty inherent in observations of the universe at extreme distances. It has three different but closely related meanings: It is sometimes used, incorrectly, to mean sample variance - the difference between different finite samples of the same parent population. Such differences follow a Poissonian distribution, and in this case the term sample variance should be used instead.".
- Cosmic_variance label "Cosmic variance".
- Cosmic_variance sameAs Varianza_cosmica.
- Cosmic_variance sameAs m.01jnjm.
- Cosmic_variance sameAs Q4008777.
- Cosmic_variance sameAs Q4008777.
- Cosmic_variance wasDerivedFrom Cosmic_variance?oldid=676616745.
- Cosmic_variance isPrimaryTopicOf Cosmic_variance.